Helicopter’s smart rotor is a typical kind of rotary machine in the aerospace industries. In the process of data acquisition and realtime control, the design of its information transmission channel is of great significance. A kind of noncontact information transmission system is designed, which can be synchronized with twoway, high speed and real time. This system uses a synchronous receive single ring coupling structure, overcoming the shortcomings of traditional transmission means. Also, the high speed transceiver circuit is designed based on LED and PIN devices with high modulation bandwidth. The circuit can work at the frequency of 100 MHz. In the system, FPGA is used as the control core to deal with data. Simulation results show that the system is of high transmission speed and low bit error rate.